A late Quaternary vegetation history from Lily Lake, Chilkat Peninsula, southeast Alaska.
A late Quaternary vegetation history from Lily Lake, Chilkat Peninsula, southeast Alaska.
复制标题
阿拉斯加东南部奇卡特半岛莉莉湖的晚第四纪植被历史。
作者：
L. Cwynar
对阿拉斯加东南部奇尔卡特半岛百合湖的一个放射性碳年代的岩心进行花粉和植物宏观化石分析，为太平洋沿岸森林的历史提供了证据。在消冰期（距今10870年）后，形成了具有丰富草本植物和蕨类植物的扭曲松林地。到10330年前，绿桤木已成为松林的重要组成部分，草本和其他灌木逐渐减少。在9480年BP，云杉（Picea sitchensis）和胡杨（Populus）在当地仍然存在，而弯叶杨（P. tortorta）种群数量下降。在现代植被中占主导地位的川杉（Tsuga heterophylla）于7880年前在当地生根。最后一个主要成分是Tsuga mertensiana，大约在6710年前加入到植被中。现代关林形成于距今2870年左右，主要以异叶柽柳和锡氏柽柳为主。优势物种到达的时间与其他研究的日期一致，这些研究表明它们沿着海岸向北迁移。关键词：化石化石；
Pollen and plant macrofossil analyses of a radiocarbon-dated core from Lily Lake on the Chilkat Peninsula, southeast Alaska, provide evidence for the history of the Pacific Coastal Forest. A Pinus contorta woodland with an abundance of herbs and ferns initially became established after deglaciation (10 870 years BP). By 10 330 years BP, Alnus viridis had become a significant component of the pine woodland while herbs and other shrubs declined. At 9480 years BP, Picea sitchensis and Populus were locally present and P. contorta populations declined. Tsuga heterophylla, which dominates the modern vegetation, became locally established at 7880 years BP. The last major component, Tsuga mertensiana, joined the vegetation about 6710 years BP. The modern closed forest, dominated by T. heterophylla and P. sitchensis, became established about 2870 years BP. The arrival times for the dominant species are compatible with dates from other studies that suggest a northward migration along the coast. Key words: fossil po...